Backend - NestJS

When to use this skill

• Creating or updating NestJS modules, controllers, services, DTOs, and pipes.
• Adding REST or GraphQL endpoints, validation, authentication, or persistence.
• Improving logging, error handling, testing, or configuration management.

Quick start

1. Install deps: npm ci (or project-standard package manager).
2. Env: copy .env.example -> .env; set database URL, JWT secrets, external service keys.
3. Dev server: npm run start:dev; prod build: npm run build and npm run start:prod.
4. Tests: npm test (unit) and npm run test:e2e (e2e); lint: npm run lint.

Core patterns

• Modules group related providers/controllers; keep dependencies minimal.
• DTOs define input/output shapes; use class-validator and class-transformer for validation and transformation.
• Controllers handle transport; services contain business logic; repositories/ORM clients manage data access.
• Use pipes for validation/transformation, filters for cross-cutting error shaping, guards for auth.